But the safety of the world, in some sense, depends on your saying "no" to inhumane ideas. Standing up for one's own integrity makes you no friends. It is costly. Yet defiance of the mob, in the service of that which is right, is one of the highest expressions of courage I know.
Commencement address, Scripps College, 2009 — http://www.scrippscollege.edu/about/commencement/gabrielle-giffords.php